Robtex

Up: 208.64.24.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 208.64.24.0/23
Down right: 208.64.26.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
208.64.24.0	PTR	placeholder.userdns.com
208.64.24.2	A+PTR	hal.userdns.com
208.64.24.2	A	userdns.com
208.64.24.2	A	ns1.678hosting.com
208.64.24.3	PTR	placeholder.userdns.com
208.64.24.4	PTR	placeholder.userdns.com
208.64.24.6	A+PTR	mirrors.versaweb.com
208.64.24.10	A	monitor.userdns.com
208.64.24.21	PTR	placeholder.userdns.com
208.64.24.21	A	mail.678hosting.com
208.64.24.21	A	*.678hosting.com
208.64.24.50	A+PTR	mf01.userdns.com
208.64.24.50	A	mx.muzicat.com
208.64.24.170	PTR	spidey.nilspace.com
208.64.25.2	A+PTR	sal.userdns.com
208.64.25.2	A	userdns.net
208.64.25.69	PTR	208-64-25.static.versaweb.net
208.64.25.69	A	lvix.net
208.64.25.74	PTR	rena.ae
208.64.25.82	PTR	dns01.pad.las.nexcess.net
208.64.25.84	PTR	unknown.nexcess.net
208.64.25.85	PTR	unknown.nexcess.net
208.64.25.90	PTR	208-64-25.static.versaweb.net
208.64.25.114	A	www.captchaentry.org
208.64.25.114	A	captchaentry.org
208.64.25.131	PTR	inparklending.com
208.64.25.131	A	mail.mhcorp.com
208.64.25.134	PTR	host.fracbamboo.com
208.64.25.145	PTR	208-64-25.static.versaweb.net
208.64.25.145	A	solfile.co.kr
208.64.25.182	PTR	fracbo0.fracbo.com
208.64.25.189	A	smtp.positivedomains.eu
208.64.25.234	PTR	208-64-25.static.versaweb.net
208.64.25.242	A	host.imsmb.com
208.64.25.242	A	main.imsmb.com
208.64.25.243	PTR	208-64-25.static.versaweb.net
208.64.25.243	A	www.imsmb.com
208.64.25.243	A	imsmb.com
208.64.25.244	PTR	208-64-25.static.versaweb.net
208.64.25.244	A	ns01.imsmb.com
208.64.25.245	A	ns02.imsmb.com
208.64.25.250	PTR	server005.wiredhub.net
208.64.25.251	PTR	grail.privateits.com
208.64.25.253	PTR	208-64-25.static.versaweb.net
208.64.25.253	A	ns1.blackapplehost.com
208.64.25.254	PTR	208-64-25.static.versaweb.net
208.64.26.18	A	fizzlers.com
208.64.26.19	PTR	208-64-26.unassigned.userdns.com
208.64.26.19	A	mx.fizzlers.net
208.64.26.19	A	fizzlers.net
208.64.26.20	A	mx.morningprayerpublishing.com
208.64.26.21	PTR	208-64-26.unassigned.userdns.com
208.64.26.21	A	michaelalvinway.net
208.64.26.22	PTR	208-64-26.unassigned.userdns.com
208.64.26.22	A	mikeway.com
208.64.26.26	PTR	mail.yakitome.com
208.64.26.30	PTR	neonetpc.net
208.64.26.42	PTR	webserver.bramjnet.com
208.64.26.43	PTR	208-64-26.unassigned.userdns.com
208.64.26.50	PTR	mgnc.mistergreengenes.com
208.64.26.50	A	mail.betterhealthtalkradio.com
208.64.26.50	A	ns1.mistergreengenes.com
208.64.26.51	A	ns2.mistergreengenes.com
208.64.26.74	PTR	box-1.londynek.net
208.64.26.75	PTR	box-2.londynek.net
208.64.26.82	PTR	aella.typhoon1.com
208.64.26.83	A	biolink.org
208.64.26.85	A	cravetempe.com
208.64.26.86	PTR	208-64-26.unassigned.userdns.com
208.64.26.86	A	www.nickstasteoftexas.com
208.64.26.86	A	nickstasteoftexas.com
208.64.26.87	PTR	208-64-26.unassigned.userdns.com
208.64.26.88	PTR	208-64-26.unassigned.userdns.com
208.64.26.88	A	ottawabellycasts.com
208.64.26.89	A	pop3.mcphersonmemorial.org
208.64.26.89	A	mail.mcphersonmemorial.org
208.64.26.89	A	soulfoodkitchenla.com
208.64.26.90	PTR	208-64-26.unassigned.userdns.com
208.64.26.92	PTR	208-64-26.unassigned.userdns.com
208.64.26.92	A	fithealthcareclinic.com
208.64.26.94	PTR	208-64-26.unassigned.userdns.com
208.64.26.94	A	mail.keatingsrivergrill.com
208.64.26.94	A	*.keatingsrivergrill.com
208.64.26.106	PTR	server.alhusain.net
208.64.26.250	PTR	box-1.londynek.net
208.64.27.4	PTR	eagle.galaxy-solutions.com
208.64.27.10	PTR	208-64-27.static-reverse.userdns.com
208.64.27.10	A	server1.music.us
208.64.27.98	PTR	emailserver3.howtoburndvd.net
208.64.27.98	A	spletka.org
208.64.27.98	A	topmostvpn.net
208.64.27.99	PTR	usvip3.noc40.com
208.64.27.104	PTR	208-64-27.static-reverse.userdns.com
208.64.27.104	A	ns1.akinaipop.com
208.64.27.104	A	ns1.jackiespencilportraits.com
208.64.27.109	A	iniciohost.com
208.64.27.115	A	*.blogonevent.com
208.64.27.115	A	joeltechnologies.com
208.64.27.115	A	blogonevent.com
208.64.27.120	A	onspothosting.com
208.64.27.121	A	detoxingguru.com
208.64.27.123	A	roninweb.net
208.64.27.123	A	www.roninweb.net
208.64.27.124	PTR	208-64-27.static-reverse.userdns.com
208.64.27.124	A	mail.radiolt14.com.ar
208.64.27.124	A	nfldraftmonsters.com
208.64.27.186	A	10xdev.com
208.64.27.226	PTR	208-64-27.static-reverse.userdns.com
208.64.27.250	PTR	208-64-27.static-reverse.userdns.com